+++
title = "Add a threshold to a legacy graph panel"
weight = 40
aliases = ["/docs/sources/panels/specify-thresholds/add-threshold-to-graph/"]
+++

# Add a threshold to a legacy graph panel

In the Graph panel visualization, thresholds enable you to add lines or sections to a graph to make it easier to recognize when the graph crosses a threshold.

## Before you begin

- [Add a panel to a dashboard]({{< relref "../working-with-panels/add-panel.md" >}}).

**To add a threshold to a graph panel**:

1. Navigate to the graph panel to which you want to add a threshold.
1. On the **Panel** tab, click **Thresholds**.
1. Click **Add threshold**.
1. Complete the following fields:
   - **T1 -** Both values are required to display a threshold.
     - **lt** or **gt** - Select **lt** for less than or **gt** for greater than to indicate what the threshold applies to.
     - **Value -** Enter a threshold value. Grafana draws a threshold line along the Y-axis at that value.
   - **Color -** Choose a condition that corresponds to a color, or define your own color.
     - **custom -** You define the fill color and line color.
     - **critical -** Fill and line color are red.
     - **warning -** Fill and line color are yellow.
     - **ok -** Fill and line color are green.
   - **Fill -** Controls whether the threshold fill is displayed.
   - **Line -** Controls whether the threshold line is displayed.
   - **Y-Axis -** Choose **left** or **right**.
1. Click **Save** to save the changes in the dashboard.